Interferometric three-dimensional imaging and micro-motion feature extraction method of broadband radar spatial conical target

Abstract

In order to solve problems that an actual three-dimensional image and a three-dimensional micro-motion feature of a target can not be obtained easily by the existing single-base and dual-base / multi-base radar methods and the system realization becomes complicated, the invention relates to an interferometric three-dimensional imaging and micro-motion feature extraction method of a broadband radar spatial conical target by introducing an ideal of multi-antenna interference processing in an interferometric inverse synthetic aperture radar (InISAR) into the three-dimensional imaging and three-dimensional micro-motion feature extraction study of the spatial conical target. On the basis of combination of the micro-doppler effect and the multi-antenna interference processing technology, actual three-dimensional imaging of a spatial conical target is realized by using a distance-slow time image; a coordinate value that has the dimension consistent with the physical dimension of the target and is capable of reflecting actual three-dimensional scattering distribution information of a scattering point at each instantaneous time is obtained; and a micro-motion parameter and a structural parameter of the target are obtained based on precise solving. After verification of example simulation, compared with the existing method, the provided method has advantages of simple operation, easiness in system realization, good robustness, more target parameter extraction, and good application value.

Description

technical field [0001] The invention relates to signal and information processing technology, in particular to an interferometric three-dimensional imaging and micro-movement feature extraction method of a broadband radar space cone target. Background technique [0002] At present, with the rapid development of modern radar technology, space target detection and recognition technology has developed from the simple orbit measurement stage to the feature information measurement stage, that is, through the use of one-dimensional range imaging, inverse synthetic aperture radar (ISAR) imaging, micro-multi Micro-Doppler (micro-Doppler) feature analysis and other methods and means can obtain the target's shape, volume, surface physical parameters, micro-motion parameters, etc., and provide rich feature information for target recognition. Especially based on the micro-Doppler effect of the target, using modern signal processing methods to obtain the 3D imaging features and 3D micro-...

AI Technical Summary

Problems solved by technology

Although this type of method can reconstruct the real three-dimensional distribution of target scattering points in space under ideal conditions, and can also accurately invert the real three-dimensional micro-motion characteristics of the target, in practical applications, the anisotropy of the scattering center on the target and the scattering The occlusion effect between points will make the joint processing of radar echoes extremely complicated and difficult, and the effectiveness of existing methods in practical applications needs to be further tested

At the same time, since this type of method needs to jointly process the echoes of multiple radars, the system implementation is relatively complicated, and it is not conducive to practical applications.

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